CN117656481A - Scanning control method and device of additive manufacturing equipment and additive manufacturing equipment - Google Patents
Scanning control method and device of additive manufacturing equipment and additive manufacturing equipment Download PDFInfo
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- CN117656481A CN117656481A CN202410123368.0A CN202410123368A CN117656481A CN 117656481 A CN117656481 A CN 117656481A CN 202410123368 A CN202410123368 A CN 202410123368A CN 117656481 A CN117656481 A CN 117656481A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 60
- 239000000654 additive Substances 0.000 title claims abstract description 59
- 230000000996 additive effect Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000003287 optical effect Effects 0.000 claims abstract description 198
- 230000002159 abnormal effect Effects 0.000 claims description 55
- 238000004590 computer program Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The scanning control method and device of the additive manufacturing equipment and the additive manufacturing equipment, wherein the additive manufacturing equipment comprises a controller and at least one scanning module, each scanning module comprises at least two optical systems, and the scanning control method comprises the following steps: the controller acquires the section profile of the current layer obtained by slicing; the controller controls the optical system to scan the section outline of the current layer of the working area according to a preset scanning sequence, when one or more optical systems fail, the scanning operation of the optical system in the failure state is stopped, and the optical system in the normal state in the scanning module to which the optical system belongs is controlled to take over and continue scanning. When one or more optical systems are in fault, the scanning task can be quickly replaced by other optical systems in normal states, so that the forming quality of a workpiece to be printed and the working efficiency of the additive manufacturing equipment are improved, and the working reliability of the additive manufacturing equipment is ensured.
Description
Technical Field
The present disclosure relates to the field of additive manufacturing technologies, and in particular, to a scanning control method and apparatus for an additive manufacturing device, and an additive manufacturing device.
Background
The additive manufacturing technology is a rapid manufacturing technology for forming a three-dimensional object by controlling laser scanning layer by layer and stacking layer by layer. The process flow is as follows: firstly, slicing a three-dimensional model of a workpiece to obtain contour information of each layer of the workpiece; uniformly spreading powdery material on the surface of a working platform, and selectively melting the powder by a laser according to a system instruction; after one section is finished, a layer of new material is paved, and scanning is continuously and selectively carried out according to the section information corresponding to the three-dimensional object; according to the method, the next section is subjected to powder paving scanning, and finally the three-dimensional object is obtained.
As the size of the workpiece to be printed becomes larger, more and more additive manufacturing apparatuses employ multiple optical systems to improve the sintering efficiency per unit area and shorten the sintering time per unit area. However, due to the complexity and increased number of optical systems, it means that it may cause higher control difficulty and failure rate, and when one of the optical systems has a problem, the overall efficiency and molding quality of the additive manufacturing apparatus may be affected, and in severe cases, even print interruption may be caused, resulting in serious economic loss and time loss.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a scanning control method and device of an additive manufacturing device and the additive manufacturing device, wherein the scanning control method of the additive manufacturing device can rapidly replace a scanning task by other optical systems when one or more optical systems are in fault, so that the forming quality of a workpiece to be printed and the working efficiency of the additive manufacturing device are improved, and the working reliability of the additive manufacturing device is ensured.
In order to achieve the above object, the present invention provides a scan control method of an additive manufacturing apparatus including a controller and at least one scan module, each scan module including at least two optical systems, wherein the scan control method includes:
the controller acquires the section profile of the current layer obtained by slicing;
the controller controls the optical system to scan the section outline of the current layer of the working area according to a preset scanning sequence, when one or more optical systems fail, the scanning operation of the optical system in the failure state is stopped, and the optical system in the normal state in the scanning module to which the optical system belongs is controlled to take over and continue scanning.
As a further preferred embodiment of the invention, for the cross-sectional profile of the current layer, all optical systems of at least one scanning module are scanned in the following preset scanning sequence:
dividing a unit area into N columns along the wind field direction of the additive manufacturing equipment, wherein the unit area is an area distributed in a working area by the scanning module;
controlling all optical systems of the scanning module to distribute scanning areas of each column containing the section outline, wherein the time difference of the scanning areas distributed by any two optical systems in each column is smaller than or equal to a first preset time, and the scanning time of the scanning areas distributed by each optical system is smaller than or equal to a second preset time;
all optical systems are controlled to scan each column of the unit area in turn.
As a further preferable aspect of the present invention, the scan control method of the scan module further includes:
when the optical system with a fault at a certain moment is one, judging the rest non-scanning area and scanning abnormal area in the scanning area allocated by the current column which is being scanned by the optical system, and recording the rest non-scanning area and the scanning abnormal area as abnormal areas;
when the optical system with faults at a certain moment is two or more, judging the sum of the remaining non-scanning area and the scanning abnormal area in the scanning area allocated by the current column which is being scanned by the two or more optical systems respectively, and recording the sum as the abnormal area;
when the area of the abnormal area is smaller than or equal to the preset area, controlling an optical system in a normal state of the scanning area of the current column which is distributed firstly in the scanning module to scan the abnormal area; when the area of the abnormal region is larger than the preset area, controlling all the optical systems in the normal state in the scanning module to scan the abnormal region after finishing scanning the scanning region correspondingly allocated to the current column of the optical systems in the normal state, wherein the time difference of the optical systems in any two normal states to the scanning region allocated to the abnormal region is smaller than or equal to the first preset time.
As a further preferable mode of the present invention, the preset area is one fourth of the total area of the abnormal region.
As a further preferable aspect of the present invention, before the at least one optical system in the normal state scans the abnormal region, the at least one optical system in the normal state needs to scan the scanning region of the current column.
As a further preferable aspect of the present invention, the scan control method of the scan module further includes:
and for all columns of the unit area, which are behind the current column of the abnormal area, controlling all optical systems in the normal state in the scanning module to carry out scanning area distribution on each column containing the cross section outline, wherein the time difference of the scanning areas distributed by any two optical systems in each column is smaller than or equal to a first preset time, and the scanning time of the scanning areas distributed by each optical system is smaller than or equal to a second preset time.
As a further preferable aspect of the present invention, before the scanning module scans the cross-sectional profile of the current layer, the scanning control method of the scanning module further includes:
judging whether all optical systems contained in the scanning module are normal or not;
when all the optical systems are in a normal state, controlling all the optical systems to scan the section outline of the current layer according to a preset scanning sequence;
when one or more optical systems are in fault, the scanning operation of the optical system in the fault state is stopped, and the optical system in the normal state in the scanning module is controlled to take over and continue scanning.
As a further preferable scheme of the invention, the additive manufacturing device further comprises an image sensor, wherein the image sensor is used for acquiring gray information of a region scanned by each optical system on the cross section contour in real time and transmitting the gray information to the controller;
the controller is used for judging whether the optical system has faults or not according to the gray information of each optical system.
The invention also provides a scanning control device of the additive manufacturing equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the scanning control method of the additive manufacturing equipment when executing the computer program.
The invention also provides additive manufacturing equipment, which comprises the scanning control device of the additive manufacturing equipment.
The scanning control method and device of the additive manufacturing equipment and the additive manufacturing equipment have the following beneficial effects by adopting the technical scheme:
when one or more optical systems are in fault, the scanning task can be quickly replaced by other optical systems in normal states, so that the forming quality of a workpiece to be printed and the working efficiency of the additive manufacturing equipment are improved, and the working reliability of the additive manufacturing equipment is ensured;
according to the invention, the optical system is divided into the scanning modules, so that when the molding size of the equipment is larger and the number of the required optical systems is larger, the independent work of each scanning module is facilitated, and the working efficiency is higher; furthermore, the scanning range of the optical system in each scanning module only needs to cover the unit area allocated by the scanning module, thereby reducing the configuration requirement of the optical system.
Drawings
FIG. 1 is a schematic illustration of an exemplary arrangement of various optical systems provided by an additive manufacturing apparatus according to the present invention;
FIG. 2 is a schematic diagram illustrating a scan of an embodiment of a scan control method of an additive manufacturing apparatus according to the present invention;
FIG. 3 is a second schematic scanning diagram of an embodiment of a method for controlling scanning of an additive manufacturing apparatus according to the present invention;
FIG. 4 is a third schematic diagram of a scan of an embodiment of a scan control method of an additive manufacturing apparatus according to the present invention;
FIG. 5 is a flow chart of a method of an embodiment of a scan control method for an additive manufacturing apparatus according to the present invention;
the marks in the figure:
11. 1# laser, 12, 1# scanning system, 21, 2# laser, 22, 2# scanning system, 31, 3# laser, 32, 3# scanning system, 41, 4# laser, 42, 4# scanning system, 4, working area, 5, cross-sectional profile, 6, wind field, 7, image sensor, 8, controller, 9, user, 10, control command, 11, abnormal area.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The invention provides a scanning control method of an additive manufacturing device, which comprises a controller 8 and at least one scanning module, wherein each scanning module comprises at least two optical systems, and the scanning control method comprises the following steps:
the controller 8 acquires the current layer cross-sectional profile 5 obtained by slicing;
the controller 8 controls the optical system to scan the current layer cross-section profile 5 of the working area 4 according to a preset scanning sequence, and when one or more optical systems fail, the scanning operation of the optical system in the failure state is stopped, and the optical system in the normal state in the scanning module to which the optical system belongs is controlled to take over and continue scanning.
The preset scan sequence for this step may be preset by the controller 8 according to the cross-sectional profile 5 shape of each layer prior to printing of the device, so that the device printing latency may be minimized. The predetermined scan sequence may be specifically set by a designer according to design requirements, and may be a scan sequence according to the prior art, which is not limited herein. It should be noted that the scanning strategy of the other layer cross-sectional profile 5 refers to the scanning strategy of the current layer cross-sectional profile 5.
The scanning module of the present application comprises more than two optical systems (including two), preferably the scanning module comprises 4 optical systems, which further facilitates independent control of each scanning module, although in practice it may also comprise other numbers of optical systems, which are not limited in this application. It will be appreciated that the number of scanning modules and the number of optical systems may be determined according to the size of the additive manufacturing apparatus, for example, when the size of the working area 4 is small, only one optical system or one scanning module is required, and when the size of the working area 4 is large, only one to two scanning modules are required, each scanning module including two or four optical systems; when the working area 4 is formed in a large size, a plurality of scanning modules may be required, each including four optical systems.
In particular, the one (also referred to as one set) of optical systems includes one laser and one scanning system, and of course, one set of optical systems may also include one scanning system and a laser that is shared with other optical systems, i.e., one laser is shared by two or more sets of optical systems. The optical system included in each scanning module may be configured in a different arrangement, as shown in fig. 1, which may be a "field" arrangement, a "one" arrangement, a "ring" arrangement, etc., which is not limited in this application.
As a preferred embodiment of the invention, for the cross-sectional profile 5 of the current layer, all optical systems of at least one scanning module are scanned according to the following preset scanning sequence:
dividing a unit area into N columns along the direction of a wind field 6 of the additive manufacturing equipment, wherein the unit area is an area distributed in a working area 4 by the scanning module; the N columns in this step may be equal or unequal. For example, where the cross-sectional profile 5 has a narrow strip-shaped portion, N is preferably unequal.
Controlling all optical systems of the scanning module to perform scanning area distribution on each column containing the cross section outline 5, wherein the time difference of the scanning areas distributed by any two optical systems in each column is smaller than or equal to a first preset time, and the scanning time of the scanning areas distributed by each optical system is smaller than or equal to a second preset time; the first preset time and the second preset time are specifically defined according to the size of the working area 4 and the number of optical systems, for example, when the working area 4 is larger, the first preset time and the second preset time are longer, preferably, when the working area 4 is 400mm×400mm, and the optical systems are 4, the first preset time is 10-20S, and the second preset time is 1-1.5min.
All optical systems are controlled to scan each column of the cell area in turn (e.g., from left to right, or from right to left of the cell area).
It should be noted that, the above-mentioned preset scanning sequence is applicable to one, several or multiple scanning modules, and the like, and preferably, all the scanning modules, that is, all the scanning modules included in the additive manufacturing apparatus of the present application are executed with reference to the above-mentioned preset scanning sequence, so that the forming efficiency can be further improved.
Specifically, the scanning control method of the scanning module further comprises the following steps:
when the optical system which has a fault at a certain moment is one, judging the rest non-scanning area and the scanning abnormal area 11 in the scanning area allocated by the current column which is being scanned by the optical system, and recording as the abnormal area 11;
when two or more optical systems with faults at a certain moment are used, judging the sum of the remaining non-scanning area and the scanning abnormal area 11 in the scanning area allocated by the current column which is being scanned by the two or more optical systems respectively, and recording the sum as the abnormal area 11; here, if the scanned region does not have the abnormal region 11, the abnormal region 11 includes only the remaining non-scanned region.
When the area of the abnormal region 11 is smaller than or equal to the preset area, controlling an optical system in a normal state of the scanning region of the current column which is distributed firstly in the scanning module to scan the abnormal region 11; when the area of the abnormal region 11 is larger than the preset area, all the optical systems in the normal state in the scanning module are controlled to scan the abnormal region 11 after the scanning of the scanning region corresponding to the current column is completed, and the time difference between the scanning regions allocated to the abnormal region 11 by any two optical systems in the normal state is smaller than or equal to the first preset time (for example, 15S). Further preferably, the scanning areas allocated in the abnormal area 11 by all the optical systems in the normal state do not overlap in the direction of the wind field 6.
In a specific implementation, the preset area is preferably one fourth of the total area of the abnormal area 11, and may be specifically set by a designer's requirement, which is not limited herein.
When the controller 8 detects that the optical system fails, corresponding information is sent to prompt the user 9, the user 9 can overhaul the optical system in the failure state according to the failure information sent by the controller 8, the overhaul process does not need to pause the scanning process of other optical systems, and after overhaul is completed, the user 9 sends a control instruction 10 to the controller 8, namely the state of the optical system is restored to the normal state.
When the optical system fails, how to arrange the optical system in a normal state can quickly ensure the normal operation of the equipment, and is one of main innovation points of the application. By adopting the fault processing mode, when the optical system fails, the time for other optical systems in normal states to finish the scanning area allocated by the current column is shorter, and the time difference for any two optical systems in normal states to finish the scanning area allocated by the current column is also shorter, so that the optical system in normal states can rapidly take over scanning for the optical system in the fault state after rapidly finishing the scanning area allocated by the current column, thereby reducing the scanning waiting time of the optical system, and improving the forming efficiency of equipment.
In this application, before at least one optical system in a normal state scans the abnormal region 11, the at least one optical system in a normal state needs to scan the current column of scanning regions, so that the task of the optical system in a normal state is not affected by the task of the optical system in a fault state, that is, the reliability of the operation of the device is further ensured.
In this application, the scan control method of the scan module further includes:
and for all columns of the unit area, which are behind the current column in which the abnormal area 11 is located, controlling all optical systems in the normal state in the scanning module to perform scanning area distribution on each column containing the cross section outline 5, wherein the time difference of the scanning areas distributed by any two optical systems in each column is smaller than or equal to a first preset time, and the scanning time of the scanning areas distributed by each optical system is smaller than or equal to a second preset time. For example, when the total column number N of the cell region is eight columns, the first column and the second column … … are sequentially named. When the abnormal region 11 is located in the third column, all columns subsequent to the current column in which the abnormal region 11 is located in the cell region are referred to as fourth column to eighth column.
In a specific implementation, when a unit area scans for a plurality of faults (faults occur at different moments) at a current layer, each time a scanning strategy for a fault is adopted, the method is executed with reference to the above scheme, for example, when an optical system a is first faulted, an abnormal area 11 occurs in a second column, the strategy is executed with reference to the above scheme for a third column to an eighth column, and if a second fault occurs in the layer and the faulted optical system is B, the abnormal area 11 occurs in a fifth column, the rest of the sixth column to the eighth column is processed and executed for the second fault, and the previous third column to the fourth column is processed and executed for the first fault, and the execution strategy of the fifth column is executed with reference to the execution strategy of the second column. That is, the processing manner of the optical system for the fault state described above is applicable to an optical system in which a fault state occurs at each time.
Specifically, before the scanning module scans the cross-sectional profile 5 of the current layer, the scanning control method of the scanning module further includes:
judging whether all optical systems contained in the scanning module are normal or not;
when all the optical systems are in a normal state, controlling all the optical systems to scan the section profile 5 of the current layer according to a preset scanning sequence; the normal state optical system herein also includes an optical system that has failed before and has been repaired.
When one or more optical systems are in fault, the scanning operation of the optical system in the fault state is stopped, and the optical system in the normal state in the scanning module is controlled to take over and continue scanning.
Preferably, the additive manufacturing apparatus further comprises an image sensor 7 for acquiring gray information of the area scanned by each optical system on the cross-sectional profile 5 in real time and transmitting the gray information to the controller 8;
the controller 8 is configured to determine whether the optical system is faulty according to the gray information of each optical system, for example, a standard gray value and an error range may be set first, and when the difference between the gray value of the optical system and the standard gray value exceeds the error range, the fault is determined. The fault mode of the judging optical system is better in real-time performance and higher in accuracy. Of course, in the implementation, the following manner may also be adopted for judgment:
the first way is that the image sensor 7 captures the data information of the brightness value of the laser beam of each optical system acting on the laser scanning path and transmits the data information to the controller 8, the controller 8 compares the data information with the brightness value of the laser emitted by the optical system to judge whether the energy fluctuation of the laser beam is normal or not, and if not, the optical system is judged to be faulty;
the second way is that the change of the corresponding parameters of the current scanning layer of the system can be captured through an infrared sensor, a laser power meter and the like, so as to judge whether the optical system of the system is normal or fault, for example, the temperature of a sintered molten pool is detected through the infrared sensor, and when the detected highest temperature exceeds or is lower than a set temperature range, the optical system is judged to be fault; similarly, the laser power applied to the laser scanning path is detected by the laser power meter, and if the laser power exceeds the set power, the optical system is judged to be defective.
The invention also provides a scanning control device of the additive manufacturing equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the scanning control method of the additive manufacturing equipment when executing the computer program.
The invention also provides additive manufacturing equipment, which comprises the scanning control device of the additive manufacturing equipment.
In order to enable those skilled in the art to better understand and practice the technical solutions of the present invention, the technical solutions of the present invention are described in detail below by way of examples with reference to the accompanying drawings.
The additive manufacturing apparatus of this embodiment includes one scanning module including four optical systems, as shown in fig. 2, a # 1 optical system composed of a # 1 scanning system 12 and a # 1 laser 11, a # 2 optical system composed of a # 2 laser 21 and a # 2 scanning system 22, a # 3 optical system composed of a # 3 laser 31 and a # 3 scanning system 32, a # 4 optical system composed of a # 4 laser 41 and a # 4 scanning system 42, and 4 sets of optical systems collectively operating above the working area 4. Prior to laser sintering, the controller 8 acquires the current layer cross-sectional profile 5 obtained by dicing; and controls the optical system to scan the current layer cross-sectional profile 5 of the working area 4 according to a preset scanning sequence.
The preset scanning sequence is as follows: the whole unit area (namely the working area 4) is divided into N columns (N=1, 2,3 and … …) along the direction of the wind field 6 at the current layer, and each column is scanned by 4 sets of optical systems together, namely each column area is divided into scanning areas (1), (2), (3) and (4) with different sizes, and the scanning areas correspond to 4 sets of optical systems. The size division of the scanning areas (1), (2), (3) and (4) is less than or equal to 15s according to the scanning completion time difference of any two sets of optical systems, and the column number N division is less than or equal to 1min according to the scanning completion time of any one scanning area (1), (2), (3) and (4) in the column. It should be noted that, the scanning area allocated to each optical system in each column may be continuous or discontinuous, that is, the scanning area corresponding to each optical system may be one block or multiple blocks.
With further reference to fig. 5, the image sensor 7 located near the working area 4 acquires the gray information of the scanned area of each set of optical system in the working area 4 in real time during the scanning process, and transmits the gray information to the controller 8, and the controller 8 determines the working state of each set of optical system according to the gray information.
When the 4 sets of optical systems included in the scanning module all belong to a normal state, the 4 sets of optical systems are sequentially performed from downstream to upstream of the wind field 6 according to N columns (the division manner is according to the preset scanning sequence) of the current layer shown in fig. 2. Each row is divided into scanning areas according to the preset scanning sequence by the controller 8, instructions are issued to each set of optical systems, and each set of optical systems work cooperatively to complete the scanning of the corresponding areas (1), (2), (3) and (4).
As shown in fig. 3, when detecting that the gray value of the third column scanning area (3) is lower than the set value δ, it is determined that the operating state of the 3# optical system scanning the area does not meet the requirement (i.e., the optical system determined as the failure state), the controller 8 sends an instruction to the 3# optical system, stops the laser beam input and the operation of the 3# scanning system 32, releases the 3# optical system failure signal, prompts the user 9 to check the abnormality, and at the same time, the controller 8 compares the acquired gray information with the slice information to obtain an abnormal area 11 (the non-scanned area in the current column scanning area (3), if there is a case that the scanned area is abnormal as a matter of course, the abnormal portion of the scanned area is also included in the abnormal area 11), and since the abnormal area 11 is larger than one fourth of the area of the scanned area (3), the abnormal area 11 is scanned by controlling the 1# optical system, the 2# optical system and the 4# optical system to scan the abnormal area 11 and the whole remaining non-scanned area again, the time difference of the scanned area allocated by any two of the 1# optical system, the 2# optical system and the 4# optical system to the abnormal area 11 is required to be smaller than or equal to the first preset time (for example, 15S), and the scanned areas allocated by all the optical systems in the abnormal area 11 are not overlapped in the wind field 6 direction.
The dividing principle of the remaining columns which are not scanned also meets the requirement that the scanning completion time difference is less than or equal to 15s, and the current layer column number N is kept unchanged. As shown in fig. 4, the optical systems # 1, # 2 and # 4 which can normally operate follow a predetermined scanning strategy for the remaining columns (fourth column and fifth column) of the current layer to cooperatively complete scanning. The predetermined scanning strategy is as follows: and controlling the No. 1, no. 2 and No. 4 optical systems to perform scanning area distribution on each column containing the cross section profile 5, wherein the time difference of the scanning areas distributed by any two optical systems in each column is smaller than or equal to a first preset time, and the scanning time of the scanning areas distributed by each optical system is smaller than or equal to a second preset time.
In the normal operation process of the equipment, the user 9 can overhaul according to the fault information sent by the controller 8, the overhaul process does not need to pause the scanning process, the overhaul is completed, the user 9 sends an instruction to the controller 8, and the 3# optical system is restarted.
For each subsequent layer, judging whether all optical systems contained in the scanning module are normal or not;
when all the optical systems are in a normal state, controlling all the optical systems to scan the section profile 5 of the current layer according to the preset scanning sequence; otherwise, the processing is performed with reference to the scanning strategy of the scanning layer in the fault condition, which is not repeated here.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (9)
1. A scan control method of an additive manufacturing apparatus, the additive manufacturing apparatus comprising a controller and at least one scan module, each scan module comprising at least two optical systems, wherein the scan control method comprises:
the controller acquires the section profile of the current layer obtained by slicing;
the controller controls the optical system to scan the section outline of the current layer of the working area according to a preset scanning sequence, when one or more optical systems fail, the scanning operation of the optical system in the failure state is stopped, and the optical system in the normal state in the scanning module to which the optical system belongs is controlled to take over and continue scanning; wherein,
for the cross-sectional profile of the current layer, all optical systems of at least one scanning module are scanned according to the following preset scanning sequence:
dividing a unit area into N columns along the wind field direction of the additive manufacturing equipment, wherein the unit area is an area distributed in a working area by the scanning module;
controlling all optical systems of the scanning module to distribute scanning areas of each column containing the section outline, wherein the time difference of the scanning areas distributed by any two optical systems in each column is smaller than or equal to a first preset time, and the scanning time of the scanning areas distributed by each optical system is smaller than or equal to a second preset time;
all optical systems are controlled to scan each column of the unit area in turn.
2. The scan control method of an additive manufacturing apparatus according to claim 1, wherein the scan control method of the scan module further comprises:
when the optical system with a fault at a certain moment is one, judging the rest non-scanning area and scanning abnormal area in the scanning area allocated by the current column which is being scanned by the optical system, and recording the rest non-scanning area and the scanning abnormal area as abnormal areas;
when the optical system with faults at a certain moment is two or more, judging the sum of the remaining non-scanning area and the scanning abnormal area in the scanning area allocated by the current column which is being scanned by the two or more optical systems respectively, and recording the sum as the abnormal area;
when the area of the abnormal area is smaller than or equal to the preset area, controlling an optical system in a normal state of the scanning area of the current column which is distributed firstly in the scanning module to scan the abnormal area; when the area of the abnormal region is larger than the preset area, controlling all the optical systems in the normal state in the scanning module to scan the abnormal region after finishing scanning the scanning region correspondingly allocated to the current column of the optical systems in the normal state, wherein the time difference of the optical systems in any two normal states to the scanning region allocated to the abnormal region is smaller than or equal to the first preset time.
3. The scan control method of an additive manufacturing apparatus according to claim 2, wherein the preset area is one-fourth of a total area of the abnormal region.
4. A scanning control method of an additive manufacturing apparatus according to claim 3, wherein the at least one normal-state optical system is required to scan a scanning area of a current column before the at least one normal-state optical system scans the abnormal area.
5. The scan control method of an additive manufacturing apparatus according to claim 4, wherein the scan control method of the scan module further comprises:
and for all columns of the unit area, which are behind the current column of the abnormal area, controlling all optical systems in the normal state in the scanning module to carry out scanning area distribution on each column containing the cross section outline, wherein the time difference of the scanning areas distributed by any two optical systems in each column is smaller than or equal to a first preset time, and the scanning time of the scanning areas distributed by each optical system is smaller than or equal to a second preset time.
6. The scan control method of an additive manufacturing apparatus according to any one of claims 1 to 5, wherein before the scan module scans the cross-sectional profile of the current layer, the scan control method of the scan module further comprises:
judging whether all optical systems contained in the scanning module are normal or not;
when all the optical systems are in a normal state, controlling all the optical systems to scan the section outline of the current layer according to a preset scanning sequence;
when one or more optical systems are in fault, the scanning operation of the optical system in the fault state is stopped, and the optical system in the normal state in the scanning module is controlled to take over and continue scanning.
7. The method for controlling scanning of an additive manufacturing apparatus according to claim 6, wherein the additive manufacturing apparatus further comprises an image sensor for acquiring gray information of a region scanned by each optical system for the cross-sectional profile in real time and transmitting the gray information to the controller;
the controller is used for judging whether the optical system has faults or not according to the gray information of each optical system.
8. A scan control device of an additive manufacturing apparatus, comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the scan control method of an additive manufacturing apparatus of any one of claims 1 to 7.
9. An additive manufacturing apparatus comprising the scan control device of claim 8.
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